SOURCES SOUGHT – REQUEST FOR INFORMATION for Electro-Magnetic Gradiometer Sensing System Hardware (EMG-SSH) Device

Description of Requirement (DoR) Electro-Magnetic Gradiometer Sensing System Hardware (EMG-SSH) Device Specifications: The U.S. Army Engineer Research and Development Center (ERDC) Geotechnical and Structures Laboratory (GSL) seeks purchase of one (1) Electro-Magnetic Gradiometer Sensing System Hardware (EMG-SSH) device that is sensitive between 50kHz-750kHz and can make measurements in the picotesla range to enable detection and mapping of long linear subsurface conductors. System Description: The ERDC GSL has the need to procure one (1) rugged Electro-Magnetic Gradiometer Sensing System Hardware (EMG-SSH) Device with the following specifications: • Rugged yet lightweight man-carry boom that can be disassembled and fit into an included 32in x 21in x 13in pelican case, or other similar rugged case, with packing foam designed to securely hold the components for storage and shipping. • Man-carry boom of about 1.75m (5.75 feet) long and including fittings for the rigid mounting of receiving antennas at each end (fore and aft) • Man-carry boom designed to hang from straps attached to a backpack, weight balanced front to rear and left to right when all components are attached • Man-carry boom designed to hang in-line with users walking direction and centered on the user’s body with angled portions that continue the boom around the side of the end-user’s body • Man-carry boom ergonomically designed, and weight balanced to have little to no pitch, yaw, or roll when end-user is walking with the backpack supported instrumentation • Differential EMG receiver electronics, sealed to protect from moisture and dust, mounted on the man-carry boom for recording magnetic field measurements across a large range of field intensities (many orders of magnitude) from large primary fields from transmitters to much smaller secondary fields in the pico-Telsa range from reradiating targets • Differential Receiver electronics with a minimum of two (2) channels programmable within the 50kHz-750kHz range to 10Hz accuracy mounted to the boom near the center in front of the user • Differential EMG receiver electronics obtains power from external Bren- Tronics model BB-2590/U, 9.9 AH Rechargeable Lithium-Ion Battery • Two (2) Bren-Tronics model BB-2590/U, 9.9 AH Rechargeable Lithium-Ion Batteries and two (2) matched chargers • Matched electrically shielded Magnetic Dipole Antenna pairs, each antenna comprised of a metal grillwork wrapped around a central ferrite core loop antenna; wherein, the metal grillwork is longitudinally split to prevent shorting out signals detectable by the central ferrite core loop antenna, which are DRAFT -- 1 of 4 -- tuned in the 50kHz to 750kHz range and are no longer than 18 inches – to obtain required tuning across the frequency range of interest it is expected that 2 or 3 matched pairs of Dipole Antennas may be necessary. • Magnetic Dipole Antenna pairs should be capable of detecting secondary fields generated in long conductors (>100m) by non- licensed intentionally radiating transmitters operated 10% down from the Federal Communications Commission (FCC) maximum emission limits as defined in CFR 2009 Title 47 Vol. 1 Part 15 section 209. • Dipole Antenna pairs designed so that they can be attached at each end of the boom, in either horizontal or vertical orientation based on situational need, that are sensitive to fields in the picotesla range, as described in the previous bullet, each electrically connected to a respective and separate input on the Differential EMG receiver • Dipole Antenna pairs are to be connected to the differential EMG receiver electronics by cables with relevant Mil-Spec connectors (examples of appropriate connectors can be seen on https://www.milnec.com/mil-spec- connectors/) providing for protection from moisture and dust • Independent and apart from the Differential EMG receiver, a small tablet computer device mounted on the man-carried boom connected to the Differential EMG receiver by cable with the ability to download stored data via removeable storage device(s) (USB, SD Card, or other similar) • Data Acquisition and Display Software (SW) installed on the small tablet computer that enables end-user to choose and perform frequency setup and validation, control initiation and stoppage of data collection, both store and visually display to a user the relative locations and magnetic field measurements collected by the differential EMG receiver in real-time as data are being collected and saved to the device • Data Acquisition SW will save EM data from each receiver independently, front and rear, at a fixed sampling rate of no less than 10Hz • Data Acquisition SW will provide indication of current filename, system status alert (green – all is good, yellow – something requires review, red – something is not operating properly) – status should include monitoring of battery, internal electronics temperature, GPS status • Differential EMG receiver electronics has a port for, accepts data from, and merges GPS navigation data, which are used to locate and log the changing positions of the EMG receiver, with the recorded EMG data – note merging of EM data and GPS data can occur within the Differential EMG Receiver electronics or in the Data Acquisition and Display Software on the tablet computer • Automatic file naming and saving using MMDD_###, where MM is two-digit month, DD is two-digit day on the month, and ### is three-digit sequential file number for that day based on start/stop control in Data Acquisition and Display Software • Saved and output data file format that meets the following criteria; csv file format with a header in the data file that indicates: Number of header lines (or some indicator of start/end of header), System label (e.g., ACME EMG v1.1), RX mode (horizontal or vertical), Any other relevant details, gains, filters, etc., Date/time of collect (start or end), Channel 1 = frequency F1, Channel 2 = DRAFT -- 2 of 4 -- frequen…